Electronic – Why do some power plugs have holes in them?


I've just learned that electrical chargers with pins with holes in them are illegal in Australia. Here's what I'm talking about (ignore the one second from the left):
Plugs with holes in them

What's the purpose of these holes?

Best Answer

Retention mechanism: Some sockets have a spring loaded ball like structure (or variant) that engages this hole as a "detent" holding the plug in place.

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